The use of ultrasound to enable low temperature electroless plating

Andrew J. Cobley, Veronica Saez

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    Purpose - Electroless plating is an important process in printed circuit board and electronics manufacturing but typically requires temperatures of 70-95C to give a suitable deposition rate. This is becoming problematic in industry due to the rising price of energy and is a major contribution to production costs. Previous studies have noted beneficial effects of ultrasonic irradiation upon electroless plating processes and it has been reported that sonication can increase the plating rate and produce changes to the chemical and physical properties of the deposited coating. The purpose of this paper is to reduce the operating temperature of an electroless nickel bath by introducing ultrasound to the process.
    Design/methodology/approach - The deposition rate of an electroless nickel solution was determined by two techniques. In the first method, test coupons were plated in an electroless nickel solution at temperatures ranging from 50-90C and the plating rate was calculated by weight gain. In the second approach the mixed potential (and hence the current density at the mixed potential) was determined by electrochemical analysis of the anodic and cathodic reactions. In both cases the plating rate was found with and without the application of an ultrasonic field (20?kHz). The electroless nickel deposits obtained in the plating tests were also analysed to determine the phosphorus content, microhardness and brightness.
    Findings - The plating rates under ultrasonic agitation were always higher than under "silent" conditions. Most importantly, considering the objectives of this study, the deposition rate under sonication at 70C was significantly higher than that found with mechanical agitation at 90C. In addition, the results indicated that the deposits produced in an ultrasonic field had consistently lower phosphorus content, higher microhardness and were brighter than those prepared in an electroless nickel bath that was not sonicated.
    Originality/value - Although previous work has been performed on the effect of ultrasound on electroless plating, all these studies have been carried out at the normal operating temperature of the electroless process. In this paper, ultrasound has been applied at temperatures well below those normally used in electroless nickel deposition to determine whether sonication can enable low temperature electroless plating.
    Original languageEnglish
    Pages (from-to)12-15
    Number of pages4
    JournalCircuit World
    Volume38
    Issue number1
    DOIs
    Publication statusPublished - 2012

    Fingerprint

    Electroless plating
    Ultrasonics
    Plating
    Nickel
    Sonication
    Deposition rates
    Temperature
    Microhardness
    Phosphorus
    Nickel deposits
    Printed circuit boards
    Chemical properties
    Luminance
    Current density
    Electronic equipment
    Physical properties
    Irradiation
    Coatings
    Costs
    Industry

    Keywords

    • Electroless
    • Electronic engineering
    • Nickel
    • Sonication
    • Temperature
    • Ultrasonics
    • Ultrasound

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Industrial and Manufacturing Engineering

    Cite this

    The use of ultrasound to enable low temperature electroless plating. / Cobley, Andrew J.; Saez, Veronica.

    In: Circuit World, Vol. 38, No. 1, 2012, p. 12-15.

    Research output: Contribution to journalArticle

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    N2 - Purpose - Electroless plating is an important process in printed circuit board and electronics manufacturing but typically requires temperatures of 70-95C to give a suitable deposition rate. This is becoming problematic in industry due to the rising price of energy and is a major contribution to production costs. Previous studies have noted beneficial effects of ultrasonic irradiation upon electroless plating processes and it has been reported that sonication can increase the plating rate and produce changes to the chemical and physical properties of the deposited coating. The purpose of this paper is to reduce the operating temperature of an electroless nickel bath by introducing ultrasound to the process. Design/methodology/approach - The deposition rate of an electroless nickel solution was determined by two techniques. In the first method, test coupons were plated in an electroless nickel solution at temperatures ranging from 50-90C and the plating rate was calculated by weight gain. In the second approach the mixed potential (and hence the current density at the mixed potential) was determined by electrochemical analysis of the anodic and cathodic reactions. In both cases the plating rate was found with and without the application of an ultrasonic field (20?kHz). The electroless nickel deposits obtained in the plating tests were also analysed to determine the phosphorus content, microhardness and brightness. Findings - The plating rates under ultrasonic agitation were always higher than under "silent" conditions. Most importantly, considering the objectives of this study, the deposition rate under sonication at 70C was significantly higher than that found with mechanical agitation at 90C. In addition, the results indicated that the deposits produced in an ultrasonic field had consistently lower phosphorus content, higher microhardness and were brighter than those prepared in an electroless nickel bath that was not sonicated. Originality/value - Although previous work has been performed on the effect of ultrasound on electroless plating, all these studies have been carried out at the normal operating temperature of the electroless process. In this paper, ultrasound has been applied at temperatures well below those normally used in electroless nickel deposition to determine whether sonication can enable low temperature electroless plating.

    AB - Purpose - Electroless plating is an important process in printed circuit board and electronics manufacturing but typically requires temperatures of 70-95C to give a suitable deposition rate. This is becoming problematic in industry due to the rising price of energy and is a major contribution to production costs. Previous studies have noted beneficial effects of ultrasonic irradiation upon electroless plating processes and it has been reported that sonication can increase the plating rate and produce changes to the chemical and physical properties of the deposited coating. The purpose of this paper is to reduce the operating temperature of an electroless nickel bath by introducing ultrasound to the process. Design/methodology/approach - The deposition rate of an electroless nickel solution was determined by two techniques. In the first method, test coupons were plated in an electroless nickel solution at temperatures ranging from 50-90C and the plating rate was calculated by weight gain. In the second approach the mixed potential (and hence the current density at the mixed potential) was determined by electrochemical analysis of the anodic and cathodic reactions. In both cases the plating rate was found with and without the application of an ultrasonic field (20?kHz). The electroless nickel deposits obtained in the plating tests were also analysed to determine the phosphorus content, microhardness and brightness. Findings - The plating rates under ultrasonic agitation were always higher than under "silent" conditions. Most importantly, considering the objectives of this study, the deposition rate under sonication at 70C was significantly higher than that found with mechanical agitation at 90C. In addition, the results indicated that the deposits produced in an ultrasonic field had consistently lower phosphorus content, higher microhardness and were brighter than those prepared in an electroless nickel bath that was not sonicated. Originality/value - Although previous work has been performed on the effect of ultrasound on electroless plating, all these studies have been carried out at the normal operating temperature of the electroless process. In this paper, ultrasound has been applied at temperatures well below those normally used in electroless nickel deposition to determine whether sonication can enable low temperature electroless plating.

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